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  • How to use FFMPEG on Python/Windows10 with Pipe for Screen recording ?

    20 septembre 2020, par Trmotta

    I'd like to record the screen with ffmpeg as it seems to be the only player out there who can record a region of the screen along with the mouse cursor.

    


    The following code was adapted from i want to display mouse pointer in my recording but it doesn't work on a Windows 10 (x64) setup (using Python 3.6).

    


    #!/usr/bin/env python3

# ffmpeg -y -pix_fmt bgr0 -f avfoundation -r 20 -t 10 -i 1 -vf scale=w=3840:h=2160 -f rawvideo /dev/null

import sys
import cv2
import time
import subprocess
import numpy as np

w,h = 100, 100

def ffmpegGrab():
    """Generator to read frames from ffmpeg subprocess"""

    #ffmpeg -f gdigrab -framerate 30 -offset_x 10 -offset_y 20 -video_size 640x480 -show_region 1 -i desktop output.mkv #CODE THAT ACTUALLY WORKS WITH FFMPEG CLI

    cmd = 'D:/Downloads/ffmpeg-20200831-4a11a6f-win64-static/ffmpeg-20200831-4a11a6f-win64-static/bin/ffmpeg.exe -f gdigrab -framerate 30 -offset_x 10 -offset_y 20 -video_size 100x100 -show_region 1 -i desktop -f image2pipe, -pix_fmt bgr24 -vcodec rawvideo -an -sn' 

    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True)
    #out, err = proc.communicate()
    while True:
        frame = proc.stdout.read(w*h*3)
        yield np.frombuffer(frame, dtype=np.uint8).reshape((h,w,3))

# Get frame generator
gen = ffmpegGrab()

# Get start time
start = time.time()

# Read video frames from ffmpeg in loop
nFrames = 0
while True:
    # Read next frame from ffmpeg
    frame = next(gen)
    nFrames += 1

    cv2.imshow('screenshot', frame)

    if cv2.waitKey(1) == ord("q"):
        break

    fps = nFrames/(time.time()-start)
    print(f'FPS: {fps}')


cv2.destroyAllWindows()
out.release()


    


    By using 'cmd' as stated above, I'll get the following error :

    


    b"ffmpeg version git-2020-08-31-4a11a6f Copyright (c) 2000-2020 the FFmpeg developers\r\n  built with gcc 10.2.1 (GCC) 20200805\r\n  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --enable-librav1e --enable-libsvtav1 --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf\r\n  libavutil      56. 58.100 / 56. 58.100\r\n  libavcodec     58.101.101 / 58.101.101\r\n  libavformat    58. 51.101 / 58. 51.101\r\n  libavdevice    58. 11.101 / 58. 11.101\r\n  libavfilter     7. 87.100 /  7. 87.100\r\n  libswscale      5.  8.100 /  5.  8.100\r\n  libswresample   3.  8.100 /  3.  8.100\r\n  libpostproc    55.  8.100 / 55.  8.100\r\nTrailing option(s) found in the command: may be ignored.\r\n[gdigrab @ 0000017ab857f100] Capturing whole desktop as 100x100x32 at (10,20)\r\nInput #0, gdigrab, from 'desktop':\r\n  Duration: N/A, start: 1599021857.538752, bitrate: 9612 kb/s\r\n    Stream #0:0: Video: bmp, bgra, 100x100, 9612 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc\r\n**At least one output file must be specified**\r\n"


    


    Which is the contents of proc (and also of proc.communicate). The program crashes right after when trying to resize this message to an image of size 100x100.

    


    I do not want to have an output file. I need to use Python subprocess along with Pipe in order to directly deliver those screen frames to my Python code, no IO required at all.

    


    If I try the following :

    


    cmd = 'D :/Downloads/ffmpeg-20200831-4a11a6f-win64-static/ffmpeg-20200831-4a11a6f-win64-static/bin/ffmpeg.exe -f gdigrab -framerate 30 -offset_x 10 -offset_y 20 -video_size 100x100 -i desktop -pix_fmt bgr24 -vcodec rawvideo -an -sn -f image2pipe'

    


    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)


    


    Then 'frame', inside 'while True', is filled with b''.

    


    Tried using the following libraries with no success, as I couldnt either find how to capture the mouse cursor or capture the screen at all : https://github.com/abhiTronix/vidgear, https://github.com/kkroening/ffmpeg-python

    


    What am I missing ?
Thank you.

    


  • How to overlay multiple landscape regions from a single input to a new portrait video ? FFmpeg

    27 août 2023, par 3V1LXD

    I have an electron program that selects multiple regions of a landscape video and lets you rearrange them in a portrait canvas. I'm having trouble building the proper ffmpeg command to create the video. I have this somewhat working. I can export 2 layers, but i can't export if i only have 1 layer or if i have 3 or more layers selected.

    


    2 regions of video selected

    


    layers [
  { top: 0, left: 658, width: 576, height: 1080 },
  { top: 262, left: 0, width: 576, height: 324 }
]
newPositions [
  { top: 0, left: 0, width: 576, height: 1080 },
  { top: 0, left: 0, width: 576, height: 324 }
]
filtergraph [0]crop=576:1080:658:0,scale=576:1080[v0];[0]crop=576:324:0:262,scale=576:324[v1];[v0][v1]overlay=0:0:0:0[out]

No Error export successful


    


    1 region selected

    


    layers [ { top: 0, left: 650, width: 576, height: 1080 } ]
newPositions [ { top: 0, left: 0, width: 576, height: 1080 } ]
filtergraph [0]crop=576:1080:650:0,scale=576:1080[v0];[v0]overlay=0:0[out]

FFmpeg error: [fc#0 @ 000001dd3b6db0c0] Cannot find a matching stream for unlabeled input pad overlay
Error initializing complex filters: Invalid argument


    


    3 regions of video selected

    


    layers [
  { top: 0, left: 641, width: 576, height: 1080 },
  { top: 250, left: 0, width: 576, height: 324 },
  { top: 756, left: 0, width: 576, height: 324 }
]
newPositions [
  { top: 0, left: 0, width: 576, height: 1080 },
  { top: 0, left: 0, width: 576, height: 324 },
  { top: 756, left: 0, width: 576, height: 324 }
]
filtergraph [0]crop=576:1080:641:0,scale=576:1080[v0];[0]crop=576:324:0:250,scale=576:324[v1];[0]crop=576:324:0:756,scale=576:324[v2];[v0][v1][v2]overlay=0:0:0:0:0:756[out]

FFmpeg error: [AVFilterGraph @ 0000018faf2189c0] More input link labels specified for filter 'overlay' than it has inputs: 3 > 2
[AVFilterGraph @ 0000018faf2189c0] Error linking filters

FFmpeg error: Failed to set value '[0]crop=576:1080:698:0,scale=576:1080[v0];[0]crop=576:324:0:264,scale=576:324[v1];[0]crop=576:324:0:756,scale=576:324[v2];[v0][v1][v2]overlay=0:0:0:0:0:0[out]' for option 'filter_complex': Invalid argument
Error parsing global options: Invalid argument


    


    I can't figure out how to construct the proper overlay command. Here is the js code i'm using from my electron app.

    


    ipcMain.handle('export-video', async (_event, args) => {
  const { videoFile, outputName, layers, newPositions } = args;
  const ffmpegPath = path.join(__dirname, 'bin', 'ffmpeg');
  const outputDir = checkOutputDir();
  
  // use same video for each layer as input
  // crop, scale, and position each layer
  // overlay each layer on top of each other

  // export video
  console.log('layers', layers);
  console.log('newPositions', newPositions);

  let filtergraph = '';

  for (let i = 0; i < layers.length; i++) {
    const { top, left, width, height } = layers[i];
    const { width: newWidth, height: newHeight } = newPositions[i];
    const filter = `[0]crop=${width}:${height}:${left}:${top},scale=${newWidth}:${newHeight}[v${i}];`;
    filtergraph += filter;
  }

  for (let i = 0; i < layers.length; i++) {
    const filter = `[v${i}]`;
    filtergraph += filter;
  }

  filtergraph += `overlay=`;
  for (let i = 0; i < layers.length; i++) {
    const { top: newTop, left: newLeft } = newPositions[i];
    const overlay = `${newLeft}:${newTop}:`;
    filtergraph += overlay;
  }

  filtergraph = filtergraph.slice(0, -1); // remove last comma
  filtergraph += `[out]`;
  
  console.log('filtergraph', filtergraph);

  const ffmpeg = spawn(ffmpegPath, [
    '-i', videoFile,
    '-filter_complex', filtergraph,
    '-map', '[out]',
    '-c:v', 'libx264',
    '-preset', 'ultrafast',
    '-crf', '18',
    '-y',
    path.join(outputDir, `${outputName}`)
  ]);  

  ffmpeg.stdout.on('data', (data) => {
    console.log(`FFmpeg output: ${data}`);
  });

  ffmpeg.stderr.on('data', (data) => {
    console.error(`FFmpeg error: ${data}`);
  });

  ffmpeg.on('close', (code) => {
    console.log(`FFmpeg process exited with code ${code}`);
    // event.reply('ffmpeg-export-done'); // Notify the renderer process
  });
});


    


    Any advice might be helpful, The docs are confusing, Thanks.

    


    Edit
I'm getting closer with this
Output :

    


    layers [
  { top: 0, left: 677, width: 576, height: 1080 },
  { top: 240, left: 0, width: 576, height: 324 }
]
newPositions [
  { top: 0, left: 0, width: 576, height: 1080 },
  { top: 0, left: 0, width: 576, height: 324 }
]
filtergraph [0]crop=576:1080:677:0,scale=576:1080[v0];[0]crop=576:324:0:240,scale=576:324[v1];[0][v0]overlay=0:0[o0];[o0][v1]overlay=0:0[o1]


    


    ipcMain.handle('export-video', async (_event, args) => {
  const { videoFile, outputName, layers, newPositions } = args;
  const ffmpegPath = path.join(__dirname, 'bin', 'ffmpeg');
  const outputDir = checkOutputDir();
  
  // use same video for each layer as input
  // crop, scale, and position each layer
  // overlay each layer on top of each other

  // export video
  console.log('layers', layers);
  console.log('newPositions', newPositions);

  let filtergraph = '';

  for (let i = 0; i < layers.length; i++) {
    const { top, left, width, height } = layers[i];
    const { width: newWidth, height: newHeight } = newPositions[i];
    const filter = `[0]crop=${width}:${height}:${left}:${top},scale=${newWidth}:${newHeight}[v${i}];`;
    filtergraph += filter;
  }

  for (let i = 0; i < layers.length; i++) {
    if (i === 0) {
      filtergraph += `[0][v${i}]overlay=`;
    } else {
      filtergraph += `[o${i-1}][v${i}]overlay=`;
    }
    const { top: newTop, left: newLeft } = newPositions[i];
    let overlay = '';
    if (i !== layers.length - 1) {
      overlay = `${newLeft}:${newTop}[o${i}];`;
    } else {
      overlay = `${newLeft}:${newTop};`;
    }
    filtergraph += overlay;
  }

  filtergraph = filtergraph.slice(0, -1); // remove last comma
  filtergraph += `[o${layers.length-1}]`;
  
  console.log('filtergraph', filtergraph);

  const ffmpeg = spawn(ffmpegPath, [
    '-i', videoFile,
    '-filter_complex', filtergraph,
    '-map', `[o${layers.length-1}]`,
    '-c:v', 'libx264',
    '-preset', 'ultrafast',
    '-crf', '18',
    '-y',
    path.join(outputDir, `${outputName}`)
  ]);  

  ffmpeg.stdout.on('data', (data) => {
    console.log(`FFmpeg output: ${data}`);
  });

  ffmpeg.stderr.on('data', (data) => {
    console.error(`FFmpeg error: ${data}`);
  });

  ffmpeg.on('close', (code) => {
    console.log(`FFmpeg process exited with code ${code}`);
    // event.reply('ffmpeg-export-done'); // Notify the renderer process
  });
});


    


    The problem I'm having now is that its overlaying the regions over the original input and keeping the landscape dimensions instead of making a portrait video.

    


  • lavfi/vf_libvmaf : convert to framesync2.

    31 juillet 2017, par Nicolas George
    lavfi/vf_libvmaf : convert to framesync2.

    After this commit, the code compiles, but on my setup it
    
segfaults before and after. It also prints the very worrying
    
warning :
    

    src/libavfilter/vf_libvmaf.c:161:66 : warning : passing argument 4 of ‘compute_vmaf’ from incompatible pointer type [-Wincompatible-pointer-types]
    
/tmp/i/include/libvmaf.h:26:8 : note : expected ‘int (*)(float *, float *, float *, int,  void *)’ but argument is of type ‘int (*)(float *, float *, float *, int,  double *, void *)’
    

    ==12116== Thread 6 :
    
==12116== Conditional jump or move depends on uninitialised value(s)
    
==12116==    at 0x526D432 : cons_ (ocval.h:1188)
    
==12116==    by 0x526D432 : GenericIT (ocval.h:1119)
    
==12116==    by 0x526D432 : OC::TranslateForNumPyClassesToArray(OC::Val&) (pickleloader.h:92)
    
==12116==    by 0x5211F5D : loads (pickleloader.h:566)
    
==12116==    by 0x5211F5D : LoadValFromArray (chooseser.h:290)
    
==12116==    by 0x5211F5D : LoadValFromFile (chooseser.h:405)
    
==12116==    by 0x5211F5D : _read_and_assert_model(char const*, OC::Val&, OC::Val&, OC::Val&, OC::Val&, OC::Val&, OC::Val&) (vmaf.cpp:77)
    
==12116==    by 0x5212B0F : VmafRunner::run(Asset, int (*)(float*, float*, float*, int, void*), void*, bool, bool, bool, bool, bool) (vmaf.cpp:149)
    
==12116==    by 0x52165B6 : RunVmaf(char const*, int, int, int (*)(float*, float*, float*, int, void*), void*, char const*, char const*, char const*, bool, bool, bool, bool, bool, char const*) (vmaf.cpp:645)
    
==12116==    by 0x518AFFF : compute_vmaf_score (vf_libvmaf.c:161)
    
==12116==    by 0x518AFFF : call_vmaf (vf_libvmaf.c:170)
    
==12116==    by 0x7967493 : start_thread (pthread_create.c:333)
    
==12116==    by 0x7F69A8E : clone (clone.S:97)
    
==12116==
    
==12116== Conditional jump or move depends on uninitialised value(s)
    
==12116==    at 0x526D432 : cons_ (ocval.h:1188)
    
==12116==    by 0x526D432 : GenericIT (ocval.h:1119)
    
==12116==    by 0x526D432 : OC::TranslateForNumPyClassesToArray(OC::Val&) (pickleloader.h:92)
    
==12116==    by 0x526D50D : OC::TranslateForNumPyClassesToArray(OC::Val&) (pickleloader.h:94)
    
==12116==    by 0x5211F5D : loads (pickleloader.h:566)
    
==12116==    by 0x5211F5D : LoadValFromArray (chooseser.h:290)
    
==12116==    by 0x5211F5D : LoadValFromFile (chooseser.h:405)
    
==12116==    by 0x5211F5D : _read_and_assert_model(char const*, OC::Val&, OC::Val&, OC::Val&, OC::Val&, OC::Val&, OC::Val&) (vmaf.cpp:77)
    
==12116==    by 0x5212B0F : VmafRunner::run(Asset, int (*)(float*, float*, float*, int, void*), void*, bool, bool, bool, bool, bool) (vmaf.cpp:149)
    
==12116==    by 0x52165B6 : RunVmaf(char const*, int, int, int (*)(float*, float*, float*, int, void*), void*, char const*, char const*, char const*, bool, bool, bool, bool, bool, char const*) (vmaf.cpp:645)
    
==12116==    by 0x518AFFF : compute_vmaf_score (vf_libvmaf.c:161)
    
==12116==    by 0x518AFFF : call_vmaf (vf_libvmaf.c:170)
    
==12116==    by 0x7967493 : start_thread (pthread_create.c:333)
    
==12116==    by 0x7F69A8E : clone (clone.S:97)
    
==12116==
    
==12116== Conditional jump or move depends on uninitialised value(s)
    
==12116==    at 0x526D432 : cons_ (ocval.h:1188)
    
==12116==    by 0x526D432 : GenericIT (ocval.h:1119)
    
==12116==    by 0x526D432 : OC::TranslateForNumPyClassesToArray(OC::Val&) (pickleloader.h:92)
    
==12116==    by 0x526D50D : OC::TranslateForNumPyClassesToArray(OC::Val&) (pickleloader.h:94)
    
==12116==    by 0x526D50D : OC::TranslateForNumPyClassesToArray(OC::Val&) (pickleloader.h:94)
    
==12116==    by 0x5211F5D : loads (pickleloader.h:566)
    
==12116==    by 0x5211F5D : LoadValFromArray (chooseser.h:290)
    
==12116==    by 0x5211F5D : LoadValFromFile (chooseser.h:405)
    
==12116==    by 0x5211F5D : _read_and_assert_model(char const*, OC::Val&, OC::Val&, OC::Val&, OC::Val&, OC::Val&, OC::Val&) (vmaf.cpp:77)
    
==12116==    by 0x5212B0F : VmafRunner::run(Asset, int (*)(float*, float*, float*, int, void*), void*, bool, bool, bool, bool, bool) (vmaf.cpp:149)
    
==12116==    by 0x52165B6 : RunVmaf(char const*, int, int, int (*)(float*, float*, float*, int, void*), void*, char const*, char const*, char const*, bool, bool, bool, bool, bool, char const*) (vmaf.cpp:645)
    
==12116==    by 0x518AFFF : compute_vmaf_score (vf_libvmaf.c:161)
    
==12116==    by 0x518AFFF : call_vmaf (vf_libvmaf.c:170)
    
==12116==    by 0x7967493 : start_thread (pthread_create.c:333)
    
==12116==    by 0x7F69A8E : clone (clone.S:97)
    
==12116==
    
==12116== Use of uninitialised value of size 8
    
==12116==    at 0x518AC79 : read_frame_8bit (vf_libvmaf.c:147)
    
==12116==    by 0x52AB5E8 : combo (combo.c:149)
    
==12116==    by 0x5212E95 : VmafRunner::run(Asset, int (*)(float*, float*, float*, int, void*), void*, bool, bool, bool, bool, bool) (vmaf.cpp:278)
    
==12116==    by 0x52165B6 : RunVmaf(char const*, int, int, int (*)(float*, float*, float*, int, void*), void*, char const*, char const*, char const*, bool, bool, bool, bool, bool, char const*) (vmaf.cpp:645)
    
==12116==    by 0x518AFFF : compute_vmaf_score (vf_libvmaf.c:161)
    
==12116==    by 0x518AFFF : call_vmaf (vf_libvmaf.c:170)
    
==12116==    by 0x7967493 : start_thread (pthread_create.c:333)
    
==12116==    by 0x7F69A8E : clone (clone.S:97)
    
==12116==
    
==12116== Invalid read of size 4
    
==12116==    at 0x518AC79 : read_frame_8bit (vf_libvmaf.c:147)
    
==12116==    by 0x52AB5E8 : combo (combo.c:149)
    
==12116==    by 0x5212E95 : VmafRunner::run(Asset, int (*)(float*, float*, float*, int, void*), void*, bool, bool, bool, bool, bool) (vmaf.cpp:278)
    
==12116==    by 0x52165B6 : RunVmaf(char const*, int, int, int (*)(float*, float*, float*, int, void*), void*, char const*, char const*, char const*, bool, bool, bool, bool, bool, char const*) (vmaf.cpp:645)
    
==12116==    by 0x518AFFF : compute_vmaf_score (vf_libvmaf.c:161)
    
==12116==    by 0x518AFFF : call_vmaf (vf_libvmaf.c:170)
    
==12116==    by 0x7967493 : start_thread (pthread_create.c:333)
    
==12116==    by 0x7F69A8E : clone (clone.S:97)
    
==12116==  Address 0x40 is not stack'd, malloc'd or (recently) free'd
    
==12116==
    
==12116==
    
==12116== Process terminating with default action of signal 11 (SIGSEGV)
    
==12116==  Access not within mapped region at address 0x40
    
==12116==    at 0x518AC79 : read_frame_8bit (vf_libvmaf.c:147)
    
==12116==    by 0x52AB5E8 : combo (combo.c:149)
    
==12116==    by 0x5212E95 : VmafRunner::run(Asset, int (*)(float*, float*, float*, int, void*), void*, bool, bool, bool, bool, bool) (vmaf.cpp:278)
    
==12116==    by 0x52165B6 : RunVmaf(char const*, int, int, int (*)(float*, float*, float*, int, void*), void*, char const*, char const*, char const*, bool, bool, bool, bool, bool, char const*) (vmaf.cpp:645)
    
==12116==    by 0x518AFFF : compute_vmaf_score (vf_libvmaf.c:161)
    
==12116==    by 0x518AFFF : call_vmaf (vf_libvmaf.c:170)
    
==12116==    by 0x7967493 : start_thread (pthread_create.c:333)
    
==12116==    by 0x7F69A8E : clone (clone.S:97)
    • [DH] libavfilter/Makefile
    • [DH] libavfilter/vf_libvmaf.c

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